2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
32 #include <net/ethernet.h>
38 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
40 #define DHCPV6_CLIENT_PORT 546
41 #define DHCPV6_SERVER_PORT 547
42 #define DHCPV6_DUID_LLADDR 3
43 #define DHCPV6_REQ_DELAY 1
46 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
47 const uint8_t transaction
[3], enum dhcpv6_msg type
);
49 static uint32_t dhcpv6_parse_ia(void *opt
, void *end
);
51 static reply_handler dhcpv6_handle_reply
;
52 static reply_handler dhcpv6_handle_advert
;
53 static reply_handler dhcpv6_handle_rebind_reply
;
54 static reply_handler dhcpv6_handle_reconfigure
;
55 static int dhcpv6_commit_advert(void);
59 // RFC 3315 - 5.5 Timeout and Delay values
60 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
61 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, "<POLL>",
62 dhcpv6_handle_reconfigure
, NULL
},
63 [DHCPV6_MSG_SOLICIT
] = {true, 1, 3600, "SOLICIT",
64 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
65 [DHCPV6_MSG_REQUEST
] = {true, 30, 10, "REQUEST",
66 dhcpv6_handle_reply
, NULL
},
67 [DHCPV6_MSG_RENEW
] = {false, 10, 600, "RENEW",
68 dhcpv6_handle_reply
, NULL
},
69 [DHCPV6_MSG_REBIND
] = {false, 10, 600, "REBIND",
70 dhcpv6_handle_rebind_reply
, NULL
},
71 [DHCPV6_MSG_RELEASE
] = {false, 1, 600, "RELEASE", NULL
, NULL
},
72 [DHCPV6_MSG_DECLINE
] = {false, 1, 3, "DECLINE", NULL
, NULL
},
73 [DHCPV6_MSG_INFO_REQ
] = {true, 1, 120, "INFOREQ",
74 dhcpv6_handle_reply
, NULL
},
80 static int ifindex
= -1;
81 static int64_t t1
= 0, t2
= 0, t3
= 0;
84 static int request_prefix
= -1;
85 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
;
86 static bool accept_reconfig
= false;
89 static uint8_t reconf_key
[16];
93 int init_dhcpv6(const char *ifname
, int request_pd
)
95 request_prefix
= request_pd
;
97 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
101 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
102 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
))
104 ifindex
= ifr
.ifr_ifindex
;
106 // Create client DUID
107 size_t client_id_len
;
108 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
109 if (client_id_len
== 0) {
110 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
111 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
112 DHCPV6_DUID_LLADDR
, 0, 1};
113 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
115 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
116 struct ifreq ifs
[100], *ifp
, *ifend
;
119 ifc
.ifc_len
= sizeof(ifs
);
121 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
122 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
123 // If our interface doesn't have an address...
124 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
125 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
126 !memcmp(&duid
[8], zero
, 6); ifp
++) {
127 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
128 sizeof(ifr
.ifr_name
));
129 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
130 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
135 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
140 htons(DHCPV6_OPT_SIP_SERVER_D
),
141 htons(DHCPV6_OPT_SIP_SERVER_A
),
142 htons(DHCPV6_OPT_DNS_SERVERS
),
143 htons(DHCPV6_OPT_DNS_DOMAIN
),
144 htons(DHCPV6_OPT_NTP_SERVER
),
145 htons(DHCPV6_OPT_AFTR_NAME
),
146 htons(DHCPV6_OPT_PD_EXCLUDE
),
148 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
151 // Configure IPv6-options
153 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
154 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
155 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
157 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
158 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
159 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)))
166 void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode
)
172 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
176 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
183 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
184 sizeof(fqdn
.data
), NULL
, NULL
);
185 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
186 fqdn
.len
= htons(fqdn_len
- 4);
192 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
196 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
199 size_t ia_pd_entries
, ia_pd_len
= 0;
200 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
201 ia_pd_entries
/= sizeof(*e
);
202 struct dhcpv6_ia_hdr hdr_ia_pd
= {
203 htons(DHCPV6_OPT_IA_PD
),
204 htons(sizeof(hdr_ia_pd
) - 4),
209 uint8_t *ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10));
210 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
212 if (e
[i
].priority
> 0)
213 ex_len
= ((e
[i
].priority
- e
[i
].length
- 1) / 8) + 6;
215 struct dhcpv6_ia_prefix p
= {
216 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
217 .len
= htons(sizeof(p
) - 4U + ex_len
),
218 .prefix
= e
[i
].length
,
222 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
223 ia_pd_len
+= sizeof(p
);
226 ia_pd
[ia_pd_len
++] = 0;
227 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
228 ia_pd
[ia_pd_len
++] = 0;
229 ia_pd
[ia_pd_len
++] = ex_len
- 4;
230 ia_pd
[ia_pd_len
++] = e
[i
].priority
;
232 uint32_t excl
= ntohl(e
[i
].router
.s6_addr32
[1]);
233 excl
>>= (64 - e
[i
].priority
);
234 excl
<<= 8 - ((e
[i
].priority
- e
[i
].length
) % 8);
236 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
237 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
238 ia_pd_len
+= ex_len
- 5;
242 struct dhcpv6_ia_prefix pref
= {
243 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
244 .len
= htons(25), .prefix
= request_prefix
246 if (request_prefix
> 0 && ia_pd_len
== 0 &&
247 (type
== DHCPV6_MSG_SOLICIT
||
248 type
== DHCPV6_MSG_REQUEST
)) {
249 ia_pd
= (uint8_t*)&pref
;
250 ia_pd_len
= sizeof(pref
);
252 hdr_ia_pd
.len
= htons(ntohs(hdr_ia_pd
.len
) + ia_pd_len
);
255 size_t ia_na_entries
, ia_na_len
= 0;
257 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
258 ia_na_entries
/= sizeof(*e
);
260 struct dhcpv6_ia_hdr hdr_ia_na
= {
261 htons(DHCPV6_OPT_IA_NA
),
262 htons(sizeof(hdr_ia_na
) - 4),
266 struct dhcpv6_ia_addr pa
[ia_na_entries
];
267 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
268 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
269 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
270 pa
[i
].addr
= e
[i
].target
;
276 ia_na_len
= sizeof(pa
);
277 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
279 // Reconfigure Accept
283 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
285 // Request Information Refresh
286 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
290 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
294 uint16_t elapsed_type
;
295 uint16_t elapsed_len
;
296 uint16_t elapsed_value
;
300 type
, {trid
[0], trid
[1], trid
[2]},
301 htons(DHCPV6_OPT_ELAPSED
), htons(2),
302 htons((ecs
> 0xffff) ? 0xffff : ecs
),
303 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
306 struct iovec iov
[] = {
311 {srv_id
, srv_id_len
},
312 {&reconf_accept
, sizeof(reconf_accept
)},
314 {&hdr_ia_na
, sizeof(hdr_ia_na
)},
316 {&hdr_ia_pd
, sizeof(hdr_ia_pd
)},
320 size_t cnt
= ARRAY_SIZE(iov
);
321 if (type
== DHCPV6_MSG_INFO_REQ
) {
323 iov
[2].iov_len
= sizeof(oro_refresh
);
324 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
325 } else if (!request_prefix
) {
329 // Disable IAs if not used
330 if (type
!= DHCPV6_MSG_REQUEST
&& type
!= DHCPV6_MSG_SOLICIT
) {
338 if (na_mode
== IA_MODE_NONE
)
341 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
342 0, ALL_DHCPV6_RELAYS
, ifindex
};
343 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
345 sendmsg(sock
, &msg
, 0);
349 static int64_t dhcpv6_rand_delay(int64_t time
)
352 odhcp6c_random(&random
, sizeof(random
));
353 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
357 int dhcpv6_request(enum dhcpv6_msg type
)
360 uint64_t timeout
= UINT32_MAX
;
361 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
364 struct timespec ts
= {0, 0};
365 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
366 nanosleep(&ts
, NULL
);
369 if (type
== DHCPV6_MSG_RELEASE
|| type
== DHCPV6_MSG_DECLINE
)
371 else if (type
== DHCPV6_MSG_UNKNOWN
)
373 else if (type
== DHCPV6_MSG_RENEW
)
374 timeout
= (t2
> t1
) ? t2
- t1
: 0;
375 else if (type
== DHCPV6_MSG_REBIND
)
376 timeout
= (t3
> t2
) ? t3
- t2
: 0;
381 syslog(LOG_NOTICE
, "Sending %s (timeout %us)", retx
->name
, (unsigned)timeout
);
383 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
385 // Generate transaction ID
386 uint8_t trid
[3] = {0, 0, 0};
387 if (type
!= DHCPV6_MSG_UNKNOWN
)
388 odhcp6c_random(trid
, sizeof(trid
));
393 rto
= (rto
== 0) ? (retx
->init_timeo
* 1000 +
394 dhcpv6_rand_delay(retx
->init_timeo
* 1000)) :
395 (2 * rto
+ dhcpv6_rand_delay(rto
));
397 if (rto
>= retx
->max_timeo
* 1000)
398 rto
= retx
->max_timeo
* 1000 +
399 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
401 // Calculate end for this round and elapsed time
402 uint64_t round_end
= round_start
+ rto
;
403 elapsed
= round_start
- start
;
405 // Don't wait too long
406 if (round_end
- start
> timeout
* 1000)
407 round_end
= timeout
* 1000 + start
;
409 // Built and send package
410 if (type
!= DHCPV6_MSG_UNKNOWN
)
411 dhcpv6_send(type
, trid
, elapsed
/ 10);
414 for (; len
< 0 && round_start
< round_end
;
415 round_start
= odhcp6c_get_milli_time()) {
416 // Check for pending signal
417 if (odhcp6c_signal_process())
420 // Set timeout for receiving
421 uint64_t t
= round_end
- round_start
;
422 struct timeval timeout
= {t
/ 1000, (t
% 1000) * 1000};
423 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
424 &timeout
, sizeof(timeout
));
427 len
= recv(sock
, buf
, sizeof(buf
), 0);
429 if (!dhcpv6_response_is_valid(buf
, len
, trid
, type
))
433 uint8_t *opt
= &buf
[4];
434 uint8_t *opt_end
= opt
+ len
- 4;
436 round_start
= odhcp6c_get_milli_time();
437 elapsed
= round_start
- start
;
438 syslog(LOG_NOTICE
, "Got a valid reply after "
439 "%ums", (unsigned)elapsed
);
441 if (retx
->handler_reply
)
442 len
= retx
->handler_reply(
445 if (round_end
- round_start
> 1000)
446 round_end
= 1000 + round_start
;
451 if (retx
->handler_finish
)
452 len
= retx
->handler_finish();
453 } while (len
< 0 && elapsed
/ 1000 < timeout
);
459 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
460 const uint8_t transaction
[3], enum dhcpv6_msg type
)
462 const struct dhcpv6_header
*rep
= buf
;
463 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
464 transaction
, sizeof(rep
->tr_id
)))
465 return false; // Invalid reply
467 if (type
== DHCPV6_MSG_SOLICIT
) {
468 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
469 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
471 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
472 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
474 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
478 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
;
479 uint16_t otype
, olen
;
480 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false;
482 size_t client_id_len
, server_id_len
;
483 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
484 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
486 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
487 if (otype
== DHCPV6_OPT_CLIENTID
) {
488 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
489 &odata
[-4], client_id
, client_id_len
);
490 } else if (otype
== DHCPV6_OPT_SERVERID
) {
491 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
492 &odata
[-4], server_id
, server_id_len
);
493 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
494 sizeof(struct dhcpv6_auth_reconfigure
)) {
495 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
496 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
500 uint8_t serverhash
[16], secretbytes
[16], hash
[16];
501 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
502 memset(r
->key
, 0, sizeof(r
->key
));
503 memcpy(secretbytes
, reconf_key
, sizeof(secretbytes
));
505 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
506 secretbytes
[i
] ^= 0x36;
509 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
510 md5_append(&md5
, buf
, len
);
511 md5_finish(&md5
, hash
);
513 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
514 secretbytes
[i
] ^= 0x36;
515 secretbytes
[i
] ^= 0x5c;
519 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
520 md5_append(&md5
, hash
, 16);
521 md5_finish(&md5
, hash
);
523 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
527 if (rep
->msg_type
== DHCPV6_MSG_RECONF
&& !rcauth_ok
)
530 return clientid_ok
&& (serverid_ok
|| server_id_len
== 0);
534 int dhcpv6_poll_reconfigure(void)
536 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
538 ret
= dhcpv6_request(ret
);
544 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
,
545 const void *opt
, const void *end
)
547 // TODO: should verify the reconfigure message
548 uint16_t otype
, olen
;
549 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
550 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
551 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
552 odata
[0] == DHCPV6_MSG_RENEW
||
553 odata
[0] == DHCPV6_MSG_INFO_REQ
))
556 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, NULL
, NULL
);
561 // Collect all advertised servers
562 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
,
563 const void *opt
, const void *end
)
565 uint16_t olen
, otype
;
567 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0}, NULL
, NULL
, 0, 0};
569 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
570 if (orig
== DHCPV6_MSG_SOLICIT
&&
571 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
572 olen
> sizeof(struct dhcpv6_ia_hdr
)) {
573 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
574 dhcpv6_parse_ia(&ia_hdr
[1], odata
+ olen
);
577 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
578 memcpy(cand
.duid
, odata
, olen
);
579 cand
.duid_len
= olen
;
580 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
581 && odata
[1] == DHCPV6_NoAddrsAvail
) {
582 if (na_mode
== IA_MODE_FORCE
) {
585 cand
.has_noaddravail
= true;
586 cand
.preference
-= 1000;
588 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
589 && odata
[1] == DHCPV6_NoPrefixAvail
) {
590 cand
.preference
-= 2000;
591 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
592 cand
.preference
>= 0) {
593 cand
.preference
= odata
[0];
594 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
595 cand
.wants_reconfigure
= true;
596 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
597 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
598 uint8_t *oend
= odata
+ olen
, *d
;
599 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
600 if (otype
== DHCPV6_OPT_IA_PREFIX
)
601 cand
.preference
+= 2000;
602 else if (otype
== DHCPV6_OPT_STATUS
&&
603 olen
>= 2 && d
[0] == 0 &&
604 d
[1] == DHCPV6_NoPrefixAvail
)
605 cand
.preference
-= 2000;
610 if (cand
.duid_len
> 0) {
611 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
612 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
613 odhcp6c_add_state(STATE_SERVER_CAND
, &cand
, sizeof(cand
));
616 if (orig
== DHCPV6_MSG_SOLICIT
) {
617 odhcp6c_clear_state(STATE_IA_NA
);
618 odhcp6c_clear_state(STATE_IA_PD
);
625 static int dhcpv6_commit_advert(void)
628 struct dhcpv6_server_cand
*c
= NULL
, *cand
=
629 odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
632 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
633 if (cand
[i
].has_noaddravail
)
634 retry
= true; // We want to try again
636 if (!c
|| c
->preference
< cand
[i
].preference
)
640 if (retry
&& na_mode
== IA_MODE_TRY
) {
641 // We give it a second try without the IA_NA
642 na_mode
= IA_MODE_NONE
;
643 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
647 uint16_t hdr
[2] = {htons(DHCPV6_OPT_SERVERID
),
649 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
650 odhcp6c_add_state(STATE_SERVER_ID
, c
->duid
, c
->duid_len
);
651 accept_reconfig
= c
->wants_reconfigure
;
652 odhcp6c_add_state(STATE_IA_NA
, c
->ia_na
, c
->ia_na_len
);
653 odhcp6c_add_state(STATE_IA_PD
, c
->ia_pd
, c
->ia_pd_len
);
656 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
660 odhcp6c_clear_state(STATE_SERVER_CAND
);
664 else if (request_prefix
|| na_mode
!= IA_MODE_NONE
)
665 return DHCPV6_STATEFUL
;
667 return DHCPV6_STATELESS
;
671 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
,
672 const void *opt
, const void *end
)
674 dhcpv6_handle_advert(orig
, opt
, end
);
675 if (dhcpv6_commit_advert() < 0) {
676 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, NULL
, NULL
);
680 return dhcpv6_handle_reply(orig
, opt
, end
);
684 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
,
685 const void *opt
, const void *end
)
688 uint16_t otype
, olen
;
692 if (orig
== DHCPV6_MSG_UNKNOWN
) {
693 static time_t last_update
= 0;
694 time_t now
= odhcp6c_get_milli_time() / 1000;
696 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
712 t1
= t2
= t3
= UINT32_MAX
;
715 if (orig
== DHCPV6_MSG_REQUEST
) {
716 // Delete NA and PD we have in the state from the Advert
717 odhcp6c_clear_state(STATE_IA_NA
);
718 odhcp6c_clear_state(STATE_IA_PD
);
722 odhcp6c_clear_state(STATE_DNS
);
723 odhcp6c_clear_state(STATE_SEARCH
);
724 odhcp6c_clear_state(STATE_SNTP_IP
);
725 odhcp6c_clear_state(STATE_SNTP_FQDN
);
726 odhcp6c_clear_state(STATE_SIP_IP
);
727 odhcp6c_clear_state(STATE_SIP_FQDN
);
728 odhcp6c_clear_state(STATE_AFTR_NAME
);
731 // Parse and find all matching IAs
732 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
733 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
734 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
735 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
736 uint32_t l_t1
= ntohl(ia_hdr
->t1
);
737 uint32_t l_t2
= ntohl(ia_hdr
->t2
);
739 // Test ID and T1-T2 validity
740 if (ia_hdr
->iaid
!= 1 || l_t2
< l_t1
)
744 uint16_t stype
, slen
;
746 // Test status and bail if error
747 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
749 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2 &&
750 (sdata
[0] || sdata
[1]))
756 uint32_t n
= dhcpv6_parse_ia(&ia_hdr
[1], odata
+ olen
);
768 if (l_t1
> 0 && t1
> l_t1
)
771 if (l_t2
> 0 && t2
> l_t2
)
774 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
776 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
777 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
778 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
779 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
780 uint16_t stype
, slen
;
782 // Test status and bail if error
783 dhcpv6_for_each_option(odata
, odata
+ olen
,
784 stype
, slen
, sdata
) {
785 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
786 stype
== NTP_SRV_ADDR
))
787 odhcp6c_add_state(STATE_SNTP_IP
,
789 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
790 odhcp6c_add_state(STATE_SNTP_FQDN
,
793 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
795 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
796 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
797 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
798 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
799 uint32_t refresh
= ntohl(*((uint32_t*)odata
));
800 if (refresh
< (uint32_t)t1
)
802 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
803 sizeof(struct dhcpv6_auth_reconfigure
)) {
804 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
805 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
807 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
808 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
810 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
812 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
813 } else if (otype
!= DHCPV6_OPT_CLIENTID
&&
814 otype
!= DHCPV6_OPT_SERVERID
) {
815 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
816 &odata
[-4], olen
+ 4);
824 static uint32_t dhcpv6_parse_ia(void *opt
, void *end
)
826 uint32_t timeout
= UINT32_MAX
; // Minimum timeout
827 uint16_t otype
, olen
;
830 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
,
831 0, 0, IN6ADDR_ANY_INIT
, 0, 0};
834 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
835 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
836 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
837 if (olen
+ 4U < sizeof(*prefix
))
840 entry
.valid
= ntohl(prefix
->valid
);
841 entry
.preferred
= ntohl(prefix
->preferred
);
843 if (entry
.preferred
> entry
.valid
)
846 entry
.length
= prefix
->prefix
;
847 entry
.target
= prefix
->addr
;
851 uint16_t stype
, slen
;
853 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
854 odata
+ olen
, stype
, slen
, sdata
) {
855 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
858 uint8_t elen
= sdata
[0];
862 if (elen
<= 32 || elen
<= entry
.length
) {
868 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
874 uint32_t exclude
= 0;
876 exclude
= exclude
<< 8 | sdata
[bytes
];
879 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
880 exclude
<<= 64 - elen
;
882 // Abusing router & priority fields for exclusion
883 entry
.router
= entry
.target
;
884 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
885 entry
.priority
= elen
;
889 odhcp6c_update_entry(STATE_IA_PD
, &entry
);
892 memset(&entry
.router
, 0, sizeof(entry
.router
));
893 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
894 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
895 if (olen
+ 4U < sizeof(*addr
))
898 entry
.preferred
= ntohl(addr
->preferred
);
899 entry
.valid
= ntohl(addr
->valid
);
901 if (entry
.preferred
> entry
.valid
)
905 entry
.target
= addr
->addr
;
907 odhcp6c_update_entry(STATE_IA_NA
, &entry
);
910 if (entry
.valid
> 0 && timeout
> entry
.valid
)
911 timeout
= entry
.valid
;